COMPLIANCE INFO_2024 FINAL SITE CHARACTERIZATION WORK PLAN

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5 Site Characterization Work Plan SWT Engineering Z:\PROJECTS\SiteLogIQ\Site Characterization Work Plan\Text\Riverbank_Site Charac. Work Plan (Feb 2024)_Final.doc methods for determining horizontal and areal extent based on site conditions, e.g., physical properties of geology, development and the fill area, are part of the intrusive investigation/field work activities outlined in this section. Once limits of waste are better defined during this intrusive field work, the estimated volume of waste in-place will be updated from the information provided in Section 3.0. The types and relative quantities of materials excavated will be characterized by using the authoritative sampling method, as discussed in Sampling and Analysis Plan (see Appendix B) . The LEA will be notified at least a week or five days when excavation activities occur to allow them to observe the materials. Soil sampling will occur at each pothole and augur boring discussed in the Sampling and Analysis Plan provided in Appendix B. If burn ash is encountered during potholing and augur boring, soil/ash samples be collected and analyzed to meet the site-specific Data Quality Objectives (DQOs) as discussed in Appendix B. If there is no visual evidence of burn dump ash, samples may be composited. Soil sample(s) will be tested at a laboratory that is certified by the California Environmental Laboratory Accreditation Program (ELAP) for the analyses to be performed. Any excavated material for waste characterization purposes will be transported off-site to a permitted solid waste facility for proper disposal or recycling. Disposal records shall be provided for all waste removed from the site and will be included in the Final Site Characterization Report, discussed below. Clean soil will be used to backfill. The criteria for clean soil will be residential (Park soils) or industrial (WWTP property) Preliminary Remediation Goals (PRGs). Procedures for verifying the adequacy of import soils will be consistent with the California Department of Toxic Substance Control (DTSC) “Advisory Clean Imported Fill Material Fact Sheet” (https://dtsc.ca.gov/information-advisory -clean-imported-fill-material-fact-sheet). Although hazardous materials are not expected to be present based on the 2011 Category “C” low threat ranking (see Appendix A), contingency protocol will be in-place should such materials be identified during excavation (see Appendix B). Potential hazardous materials may include, but are not limited to, asbestos, drums containing liquids, and potentially contaminated soils with visual discoloration, or visual presence of burn ash. Any indications of the presence of burn ash, odors, staining, discoloration, or contact with potentially hazardous materials or asbestos, will be recorded. Excavations will be backfilled with clean material. It is anticipated that the excavation activities will take up to approximately 2 days to complete and the site will be secured from public access. Water will be used to mitigate dust, if necessary. Appendix C is a sample Health and Safety Plan, which will be updated or replaced by the contractor selected to perform the field work activities. The contractors site-specific Health and Safety Plan will be reviewed and approved by the LEA prior to commencement of work. Prior to executing this Work Plan, the proper permits and approvals will be obtained and then included in the Final Site Characterization Report. The Final Site Characterization Report will be prepared to document the site characterization field work activities (along with photographic documentation) and findings, as discussed above. The most recent (available) topographic map showing the results of the characterization observation and findings, and also delineating area(s) of disposal fill will be included in the Final Report. The Final Report will be prepared under the supervision of a California Registered Civil Engineer or Certified Engineering Geologist and submitted to the LEA, CalRecycle, and CVRWQCB to support the PCLU Plan.